revs are slow to come down - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

NAPARM · 06-01-2002, 02:50

when i rev my EF (with clutch in or in neutral) the revs go up smoothly but are slow to come back down. Also when i'm driving along and take my foot off the accelerator the car "pulls" along similar to what an automatic does.
i'm thinking maybe idle sensor,
Any other suggestions as to what it might be?

ps. car has a Chiptorque chip, could this have anything to do with it?

ebxr8240 · 06-01-2002, 03:11

Check for vacuum leaks including hoses...

EDxr8EBgt · 06-01-2002, 03:59

I had the same symptoms as yours when I was running a chiptorque chip in my ED 5.0 XR and when I sold the chip to my brother he had the same problem in his XR 5.0.
This would sugest that there was a program error or maybe they intended it that way. Who knows.

EDxr8EBgt · 06-01-2002, 04:00

Try removing the chip then see how it responds without it.

svo347 · 06-01-2002, 04:32

Im not sure if the chip is doin it ... I have a chiptorque module & havent come across any probs whatsoever

botch · 06-01-2002, 06:09

could be the t.p.s - throttle position switch, which is mounted on the throttle butterfly. its a smal black plastic switch that has two screws and three wires into a single plug. there is an article in a thread somewhere that tells you how to check and adjust this switch. At idle (when your foots of the pedal) there should be a certain voltage across two of these wires at the switch.
also sometimes gunk will build up in the throttle body itself and when you take your foot off the gunk causes the butterfly to stay open just a little bit, which will suck air and give the wrong signal to the engine computer...clean it out with carby cleaner or contact cleaner.
:)

ebxr8240 · 06-01-2002, 18:28

The t.p.s is electronic.The i.a.c Idle air control. The other part on the b/fly yes could be jamming with some crud in there..
What it also could be is runung rich and the eec is putting more air in there to reduce it a epa thing? So a combo of the two..
Check that the valve [p.v.c] hasn't come out at the back of the inlet manifold in the middle..
Can you replace the chip ??

batbo6 · 06-02-2002, 05:52

if this has just started, then yes there maybe something wrong. If this has been happening since you fitted the chip, then its probably in the chip program
To some degree this may be normal. the reason for the delay (or slow) return to idle is to help reduce hydrocarbon emmisions (unburned fuel)

speedy · 06-02-2002, 06:07

I had the same problem until today. I replaced my Throttle Posotion Sensor (TPI) and it fixed the problem. If your car has a this sensor check it out.

Thanatos · 06-03-2002, 18:01

I had the same problem and it turned out to be the power steering switch...

Have you tried putting the ECU into diagnostic mode and seeing what it tells you???

Dave